US PATENT SUBCLASS 501 / 99
.~.~ Elemental carbon containing

Current as of: June, 1999
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501 /   HD   COMPOSITIONS: CERAMIC

1  DF  CERAMIC COMPOSITIONS {15}
94  DF  .~ Refractory {8}
99.~.~ Elemental carbon containing {2}
100  DF  .~.~.~> And aluminum compound (e.g., clay, aluminum oxide, etc.)
101  DF  .~.~.~> And alkaline earth metal or magnesium compound (e.g., dolomite, magnesium oxide, etc.)

DEFINITION

Classification: 501/99

Elemental carbon containing:

(under subclass 94) Subject matter wherein the refractory composition comprises elemental carbon.

(1) Note. The carbon source may be in the form of, e.g., tar, pitch, coke, or graphite.